ladewich



(No Model?) 2 SheetsSheet '1.

G.'LADEW,IOH.

SLIDING DOOR LOCK.

Patented Dec. 28, 1897.

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. SLIDING DOOR 1.0011.

No. 596,169. Patented Dec. 28,1897.

UNITED STATES 1 PATENT Orr-ion.

GEORGE LADEWICH, OF NEW YORK, Y., ASSIGN OR TO BAYER &

GARDNER, OF SAME PLACE.

SLIDING-DOOR LOCK.

SPECIFICATION forming part of Letters Patent No. 596,169, dated December 28, 1897. Application filed April 3, 1897- Serial No. 630,580. (No model.)

To all whom it may concern:

Be it known that I, GEORGE LADEWIOH, of the city and State of New York, have invented certain new and useful Improvements in Locks and Latches, of which the following is a description, reference being bad to the.

7 ticularly designed for elevators and elevatorshafts, which may be manually operated as a latch and which may also be operated by a key and be locked thereby, as will be fully pointed out in the accompanying description.

The novel features and combinations thereof which constitute the invention will be fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a face view of the latch and lock; Fig. 2, a rear view of the same, with back taken off to show the interior, the parts being in the normal position. Fig. 3 is a similar view showing the latch raised by means of the key. Fig. 4 is a similar view showing the parts locked by means of the key.

Throughout the drawings like letters of reference indicate like parts.

While I illustrate my invention as embodied'in a latch of the angular and hookshaped catch type, it must not be understood that it is restricted to this particular form, and I show this form merely as being preferable.

In the drawings the casing is shown at B, the latch bolt or lever at O, and the key, which is shown in cross-section, at D. The latch bolt or lever O is provided with the usual catch 0. The spring E operates the latch and normally holds it in the position shown in Figs. 1, 2, and 4, the catch being in position to engage the striking-plate or other part with which the latch engages. The latch may be manually raised by inserting the fingers in the opening I) in the escutcheon and easing and'pressing the vertical portion of the latchlever against the action of the spring E, so as to bring it to the position shown in Fig. 4. Fig. 1 shows the portion of the lever that is exposed to the pressure of the fingers. The

plate. on the back of the casing completely covers the lock on that side. A portion of it is seen through the opening I) in Fig. 1 and is lettered B, but it is removed from Figs. 2, 3, and 4 to show the interior. The lock is preferably so mounted that it can only be reached from one side of the door. In the case of an elevator and elevator-shaft it should only be operated from the inside of the elevator or of the shaft, respectively. In order to raise the latch from the other side, the key D must be employed.

I will now describe the key-operated looking mechanism and latch-raising mechanism. The tumblers F F may be spring-operated and of the usual type. The ward bolt or slide which controls the latch c is shown at H. In its normal position (shown in Fig. 2) when the latch is free to be manually operated, the upper end of the latch-lever 0 plays between the points or projections 77. h, carried by the ward bolt or slide H. The tumblers F F hold the parts in position, as at f. These features may be arranged in any desired manner. If now the key D is inserted in the keyhole and turned, as shown by the arrow 3, it throws the slide H, to the right of Figs. 2, 3, and 4, to the position shown in Fig. 3, the lug or projection h carrying the upper end of the latchlever G to the right and raising the latch, as seen in Fig. 3. The position of the several parts will be clear from Fig. 3. By this operationthe latch may be raised by means of the key from either side of the door at will. When the key is turned back from the position shown in Fig. 2 and withdrawn from the keyhole, the latch will be left free to be operated by hand. When the key is inserted and turned, as shown by the arrow 4, it engages the slide H in the recess cl, simultaneously raising the tumblers F F, and forces the slide H to the left of Figs. 2, 3, and 4, causing the lug or projection h to reach the position shown in Fig. 4, thereby locking the latch-lever C, so that it cannot be raised. In 5 Fig. 4 the key is shown in the position which it assumes just after this operation,but before it has been withdrawn from the keyhole; but it may of course be withdrawn from the key hole, leaving the parts locked. When, however, the latch is to be raised by the key, as in Fig. 3, the key cannot be withdrawn from the keyhole without letting the latch down and leaving the parts in the position shown in Fig. 2. This is because the key cannot make the complete revolution and cannot be withdrawn from the hole until the parts are returned to the position of Fig. 2.

It will now be seen that I have produced a manually-operated latch mechanism provided with a key-operated latch operating and locking mechanism. If the latch can be reached from but one side of the door, it is clear that only those possessed of a key can properly operate the latch from the otherside; but those possessed with a key can also lock the latch, so that it cannot be manually operated. \Vhen so locked, the possibility of the latch being raised by means of a knife or other inserted body is obviated.

I do not mean to limit myself to the details described, as some of them are by no means essential to the mechanism required in m y invention.

I have now described the embodiment of my invention which at the present time I consider preferable, and I therefore claim, and desire to secure by these Letters Patent, the fol lowin g 1. In combination with a manually-operated latch mechanism, a key-actuated locking and latch-moving mechanism, substantially as set forth.

2. In combination with the latch mechanism, accessible from one side only, a key-actuated locking and latch-operating mechanism, provided with a keyhole accessible from the other side, substantially as set forth.

In combination, the spring-pressed latch mechanism, the ward bolt or slide II, operating to actuate and to lock said latch mechanism, the key for actuating the said ward bolt or slide, and the tumblers F F, substantially as set forth.

4.. In combination, latch mechanism,a ward bolt or slide, and lock mechanism operating to lock and unlock the said latch mechanism, and also to actuate the same, substantially as set forth.

5. In combination, the latch-lever C, the ward belt or slide II, having points h h between which a portion of the said latch-lever plays, and a key for moving the said ward belt or slide II, substantially as and for the purposes set forth.

In testimony whereof I have hereunto set my hand this th day of March, A. D. 1897.

GEORGE LADEVVICII. [L.

Witnesses:

H. A. IIIMES, Louis STORK. 

